:root {
  --paper: #f7f8f3;
  --ink: #151713;
  --muted: #62695f;
  --soft: #e9ede4;
  --line: #cdd5c5;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: #ffffff;
  --accent: #0c7068;
  --accent-deep: #084b48;
  --red: #a94a35;
  --gold: #9b741b;
  --blue: #315c83;
  --violet: #70548f;
  --code: #171a16;
  --shadow: 0 18px 46px rgba(35, 45, 30, 0.1);
  --serif: Georgia, "Times New Roman", "Noto Serif SC", serif;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --mono: "SFMono-Regular", "Cascadia Mono", "Liberation Mono", Menlo, monospace;
  --toc-width: 14rem;
  --toc-gap: 2rem;
}

html[data-theme="dark"] {
  --paper: #111412;
  --ink: #f2f0e8;
  --muted: #b6bdae;
  --soft: #1b201d;
  --line: #343d36;
  --panel: rgba(25, 30, 27, 0.92);
  --panel-strong: #202622;
  --accent: #51beb5;
  --accent-deep: #9ee9e4;
  --red: #df7b64;
  --gold: #d9a340;
  --blue: #86b4e5;
  --violet: #bd9ce0;
  --code: #0c0e0d;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  max-width: 100%;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  max-width: 100%;
  overflow-x: hidden;
  color: var(--ink);
  font-family: var(--sans);
  letter-spacing: 0;
  background:
    linear-gradient(90deg, rgba(21, 23, 19, 0.035) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(0deg, rgba(21, 23, 19, 0.028) 1px, transparent 1px) 0 0 / 44px 44px,
    var(--paper);
}

html[data-theme="dark"] body {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(0deg, rgba(255, 255, 255, 0.032) 1px, transparent 1px) 0 0 / 44px 44px,
    var(--paper);
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

canvas {
  display: block;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 60;
  width: 1px;
  height: 1px;
  padding: 0.55rem 0.75rem;
  overflow: hidden;
  color: #fff;
  text-decoration: none;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  background: var(--ink);
  border-radius: 4px;
}

.skip-link:focus {
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  clip-path: none;
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  width: 100%;
  height: 3px;
}

.reading-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.85rem max(1rem, calc((100vw - 1040px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(247, 248, 243, 0.94);
  backdrop-filter: blur(14px);
}

html[data-theme="dark"] .site-header {
  background: rgba(17, 20, 18, 0.92);
}

.brand,
.module-nav a,
.page-footer a {
  text-decoration: none;
}

.brand {
  font-family: var(--serif);
  font-weight: 800;
}

.module-nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.module-nav a,
.page-footer a {
  padding: 0.42rem 0.62rem;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.68);
}

html[data-theme="dark"] .module-nav a,
html[data-theme="dark"] .page-footer a {
  background: rgba(255, 255, 255, 0.04);
}

.module-nav a:first-child {
  color: var(--accent-deep);
  background: rgba(12, 112, 104, 0.08);
}

html[data-theme="dark"] .module-nav a:first-child {
  color: #e9fffd;
  background: rgba(81, 190, 181, 0.12);
}

.module-nav a:hover,
.module-nav a:focus-visible,
.page-footer a:hover,
.page-footer a:focus-visible {
  color: #fff;
  background: var(--accent);
  outline: none;
}

.lecture {
  width: min(100% - 2rem, 940px);
  margin: 0 auto;
  overflow-x: hidden;
  padding: 2rem 0 4rem;
}

.paper-header {
  padding: 3.4rem 0 2.25rem;
  border-bottom: 3px double var(--line);
}

.kicker {
  margin: 0 0 0.82rem;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.paper-header h1 {
  max-width: 900px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3rem, 7vw, 5.35rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.subtitle {
  max-width: 820px;
  margin: 1.15rem 0 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1.12rem, 2vw, 1.45rem);
  line-height: 1.52;
}

.noscript-note {
  padding: 0.85rem 1rem;
  margin: 1rem 0;
  color: var(--red);
  font-weight: 760;
  background: rgba(169, 74, 53, 0.08);
  border: 1px solid rgba(169, 74, 53, 0.25);
  border-radius: 6px;
}

.chapter,
.intro-bridge {
  padding: 4rem 0 0;
}

.chapter-header {
  margin-bottom: 1.35rem;
}

.chapter h2,
.intro-bridge h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3.05rem);
  line-height: 1.1;
  letter-spacing: 0;
}

.chapter-summary,
.intro-bridge > p {
  max-width: 820px;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 1.03rem;
  line-height: 1.78;
}

.intro-bridge > p {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.16rem;
}

.thesis-grid,
.lesson-grid,
.concept-grid,
.formula-stack,
.model-family-grid,
.template-grid,
.reading-groups,
.judgement-grid {
  display: grid;
  gap: 1rem;
}

.thesis-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 1.5rem;
}

.thesis-grid article,
.lesson-grid article,
.concept-grid article,
.formula-stack article,
.model-family-grid article,
.template-grid article,
.reading-groups article,
.judgement-grid > div,
.checklist-panel,
.misconception-card,
.judgement-card,
.summary-matrix,
.algorithm-panel,
.lab-card,
.derivation-section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.thesis-grid article,
.concept-grid article,
.formula-stack article,
.model-family-grid article,
.reading-groups article,
.judgement-grid > div,
.checklist-panel,
.misconception-card,
.judgement-card,
.summary-matrix,
.algorithm-panel,
.lab-card,
.derivation-section {
  padding: 1rem;
}

.thesis-grid strong,
.lesson-grid strong,
.template-grid strong {
  display: block;
  color: var(--accent-deep);
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.35;
}

.thesis-grid span,
.template-grid span {
  display: block;
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.62;
}

.route-rail {
  display: grid;
  grid-template-columns: repeat(8, minmax(9rem, 1fr));
  gap: 0.45rem;
  max-width: 100%;
  contain: paint;
  padding: 0.75rem;
  margin: 1.2rem 0 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.route-rail span {
  min-height: 3.8rem;
  display: grid;
  place-items: center;
  padding: 0.72rem;
  color: var(--ink);
  font-weight: 850;
  text-align: center;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.route-rail span:nth-child(2n) {
  border-top-color: var(--blue);
}

.route-rail span:nth-child(3n) {
  border-top-color: var(--gold);
}

.concept-index {
  scroll-margin-top: 5rem;
}

.concept-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: end;
  margin: 1rem 0;
}

.concept-search {
  display: grid;
  gap: 0.45rem;
}

.concept-search span {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.concept-search input {
  width: 100%;
  min-height: 3.1rem;
  padding: 0.78rem 0.9rem;
  color: var(--ink);
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.concept-search input:focus {
  border-color: var(--accent);
  outline: 2px solid rgba(12, 112, 104, 0.18);
}

.concept-count {
  min-width: 10.5rem;
  padding: 0.72rem 0.9rem;
  margin: 0;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 850;
  text-align: center;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.concept-taxonomy {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.7rem 0 1.2rem;
}

.concept-taxonomy button {
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
  min-height: 2.25rem;
  padding: 0.45rem 0.68rem;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 850;
  cursor: pointer;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.concept-taxonomy button span {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.74rem;
}

.concept-taxonomy button.active,
.concept-taxonomy button:hover,
.concept-taxonomy button:focus-visible {
  color: #fff;
  background: var(--accent);
  outline: none;
}

.concept-taxonomy button.active span,
.concept-taxonomy button:hover span,
.concept-taxonomy button:focus-visible span {
  color: #fff;
}

.concept-modules {
  display: grid;
  gap: 2.3rem;
  margin-top: 1.35rem;
}

.concept-module {
  scroll-margin-top: 5rem;
  padding-top: 1.1rem;
  border-top: 2px solid var(--line);
}

.concept-module-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 8rem;
  gap: 1rem;
  align-items: stretch;
  margin-bottom: 0.85rem;
}

.module-kicker {
  margin: 0 0 0.4rem;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.concept-module-header h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.72rem, 3vw, 2.35rem);
  line-height: 1.12;
}

.concept-module-header p:not(.module-kicker) {
  max-width: 740px;
  margin: 0.72rem 0 0;
  color: var(--muted);
  line-height: 1.72;
}

.concept-module-header aside {
  display: grid;
  align-content: center;
  justify-items: center;
  min-height: 7.6rem;
  padding: 0.9rem;
  color: var(--accent-deep);
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.concept-module-header aside strong {
  font-family: var(--serif);
  font-size: 2.35rem;
  line-height: 1;
}

.concept-module-header aside span {
  margin-top: 0.35rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 850;
}

.module-relation {
  margin: 0.85rem 0 1rem;
  padding: 0.85rem 1rem;
  color: var(--ink);
  line-height: 1.68;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
}

.module-lab-slot {
  margin: 1rem 0 1.1rem;
}

.module-lab-slot:empty {
  display: none;
}

.concept-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
  align-items: start;
}

.concept-card {
  min-width: 0;
  overflow: hidden;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent);
  border-radius: 7px;
  box-shadow: var(--shadow);
}

.concept-card:nth-child(4n + 2) {
  border-top-color: var(--blue);
}

.concept-card:nth-child(4n + 3) {
  border-top-color: var(--gold);
}

.concept-card:nth-child(4n + 4) {
  border-top-color: var(--violet);
}

.concept-card header {
  padding: 0.95rem 1rem 0.72rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.concept-card header p {
  margin: 0 0 0.38rem;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
}

.concept-card h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.28rem;
  line-height: 1.24;
  letter-spacing: 0;
}

.concept-aliases {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.62rem;
}

.concept-aliases span {
  padding: 0.22rem 0.42rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 760;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.concept-card dl {
  display: grid;
  gap: 0;
  margin: 0;
}

.concept-card dl > div {
  display: grid;
  grid-template-columns: 6.6rem minmax(0, 1fr);
  gap: 0.85rem;
  padding: 0.82rem 1rem;
  border-bottom: 1px solid var(--line);
}

.concept-card dl > div:last-child {
  border-bottom: 0;
}

.concept-card dt {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 900;
}

.concept-card dd {
  min-width: 0;
  margin: 0;
  color: var(--ink);
  font-size: 0.96rem;
  line-height: 1.72;
}

.concept-card dd p,
.concept-qa-item p {
  margin: 0;
}

.concept-card dd ul,
.concept-qa-item ul {
  display: grid;
  gap: 0.34rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.concept-card dd li,
.concept-qa-item li {
  position: relative;
  min-width: 0;
  padding-left: 0.95rem;
  overflow-wrap: anywhere;
}

.concept-card dd li::before,
.concept-qa-item li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 0.32rem;
  height: 0.32rem;
  content: "";
  background: var(--accent);
  border-radius: 999px;
}

.concept-card mjx-container {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
}

.concept-detail {
  border-top: 1px solid var(--line);
}

.concept-detail summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.85rem 1rem;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 900;
  cursor: pointer;
  list-style: none;
  background: linear-gradient(90deg, rgba(12, 112, 104, 0.08), transparent);
}

.concept-detail summary::-webkit-details-marker {
  display: none;
}

.concept-detail summary::after {
  content: "+";
  display: grid;
  flex: 0 0 auto;
  width: 1.4rem;
  height: 1.4rem;
  place-items: center;
  color: #fff;
  background: var(--accent);
  border-radius: 4px;
}

.concept-detail[open] summary::after {
  content: "-";
}

.concept-detail summary:hover,
.concept-detail summary:focus-visible {
  color: #fff;
  background: var(--accent);
  outline: none;
}

.concept-detail-body {
  display: grid;
  gap: 0;
  padding: 0.25rem 1rem 1.05rem;
}

.concept-qa-item mjx-container {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.concept-qa-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.65rem;
}

.concept-qa-item {
  min-width: 0;
  padding: 0.8rem 0 0 0.9rem;
  border-left: 3px solid var(--line);
}

.concept-qa-item h4 {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.93rem;
  font-weight: 900;
}

.concept-qa-item p {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.68;
}

.concept-qa-item ul {
  margin-top: 0.42rem;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.68;
}

.concept-empty {
  grid-column: 1 / -1;
  padding: 1.2rem;
  color: var(--muted);
  font-weight: 760;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.appendix {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 3px double var(--line);
  opacity: 0.88;
}

.appendix .chapter-header h2::before {
  content: "附录 · ";
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 900;
}

.lesson-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.lesson-grid article {
  min-height: 12rem;
  padding: 0.9rem;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.lesson-grid p,
.template-grid span {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.62;
}

.table-wrap {
  width: 100%;
  max-width: 100%;
  contain: paint;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  background: var(--panel-strong);
}

th,
td {
  padding: 0.82rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

th {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 900;
  text-transform: uppercase;
}

td {
  color: var(--ink);
  font-size: 0.94rem;
  line-height: 1.62;
}

.derivation-section {
  margin: 1rem 0;
}

.derivation-section h3,
.algorithm-panel h3,
.summary-matrix h3,
.misconception-card h3,
.judgement-card h3,
.concept-grid h3,
.formula-stack h3,
.model-family-grid h3,
.reading-groups h3,
.checklist-panel h3 {
  margin: 0;
  color: var(--accent-deep);
  font-family: var(--serif);
  font-size: 1.32rem;
  line-height: 1.25;
}

.derivation-section p,
.concept-grid p,
.formula-stack p,
.model-family-grid p,
.algorithm-note,
.lab-explanation,
.judgement-grid p,
.checklist-panel li,
.misconception-card li,
.reading-groups li,
.compact-list li {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.72;
}

.derivation-section p {
  margin: 0.72rem 0 0;
  color: var(--ink);
}

.equation {
  position: relative;
  max-width: 100%;
  contain: paint;
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  color: var(--ink);
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.algorithm-panel {
  margin: 1rem 0;
}

.panel-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.algorithm {
  padding: 1rem;
  margin: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  color: #eef6ed;
  font-size: 0.86rem;
  line-height: 1.62;
  background: var(--code);
  border-radius: 4px;
}

.algorithm code {
  font-family: var(--mono);
}

.algorithm-note {
  margin: 0.75rem 0 0;
}

.visual-example {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.5fr);
  gap: 1rem;
  align-items: stretch;
  margin: 1.4rem 0;
}

.visual-copy {
  padding: 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.visual-copy h3 {
  margin: 0;
  color: var(--accent-deep);
  font-family: var(--serif);
  font-size: 1.28rem;
  line-height: 1.25;
}

.visual-copy p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  line-height: 1.72;
}

.lab-card {
  min-width: 0;
  background: var(--panel-strong);
}

.lab-controls-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.lab-controls-grid label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem 0.55rem;
  align-items: center;
  min-width: 0;
  padding: 0.72rem;
  color: var(--ink);
  font-size: 0.84rem;
  font-weight: 850;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.lab-controls-grid input {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

.lab-controls-grid output {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.lab-canvas {
  width: 100%;
  height: min(44vw, 400px);
  min-height: 290px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
}

html[data-theme="dark"] .lab-canvas {
  background: var(--panel-strong);
}

.lab-readout {
  min-height: 2.8rem;
  padding: 0.72rem 0.82rem;
  margin: 0.78rem 0 0;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.5;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.lab-explanation {
  margin: 0.7rem 0 0;
}

.prob-bars {
  display: grid;
  gap: 0.55rem;
  min-height: 17rem;
  padding: 0.75rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.prob-row {
  display: grid;
  grid-template-columns: 5.5rem 1fr 4.25rem;
  gap: 0.6rem;
  align-items: center;
}

.prob-label,
.prob-value {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 820;
}

.prob-track {
  height: 1.15rem;
  overflow: hidden;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 3px;
}

.prob-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
}

.concept-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.formula-stack {
  grid-template-columns: 1fr;
}

.model-family-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.model-family-grid article,
.formula-stack article,
.concept-grid article {
  min-width: 0;
}

.summary-matrix {
  margin-top: 1.2rem;
}

.summary-matrix h3,
.misconception-card h3,
.judgement-card h3 {
  margin-bottom: 0.75rem;
}

.misconception-card ul,
.checklist-panel ul,
.reading-groups ul,
.compact-list {
  padding-left: 1.2rem;
  margin: 0.75rem 0 0;
}

.judgement-card {
  margin: 1.2rem 0 0;
}

.judgement-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.judgement-grid > div {
  background: var(--panel-strong);
  box-shadow: none;
}

.judgement-grid strong {
  display: block;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.judgement-grid p {
  margin: 0.45rem 0 0;
}

.template-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.template-grid article {
  min-height: 6.2rem;
  padding: 0.92rem;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.lookup-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.lookup-grid article {
  min-height: 10rem;
  padding: 1rem;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.lookup-grid strong {
  display: block;
  color: var(--accent-deep);
  font-family: var(--serif);
  font-size: 1.14rem;
  line-height: 1.3;
}

.lookup-grid p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.66;
}

.timeline-roadmap {
  display: grid;
  grid-template-columns: repeat(6, minmax(170px, 1fr));
  gap: 0.55rem;
  padding: 0.75rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.timeline-roadmap article {
  min-height: 12.5rem;
  padding: 0.9rem;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.timeline-roadmap time {
  display: block;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 900;
}

.timeline-roadmap strong {
  display: block;
  margin-top: 0.45rem;
  color: var(--ink);
  line-height: 1.35;
}

.timeline-roadmap p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.62;
}

.checklist-panel {
  margin-top: 1.1rem;
}

.reading-groups {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.toc-toggle {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 50;
  display: none;
  padding: 0.58rem 0.78rem;
  color: #fff;
  font-weight: 850;
  cursor: pointer;
  background: var(--accent);
  border: 0;
  border-radius: 4px;
}

.lecture-toc {
  position: fixed;
  top: 6rem;
  left: max(1rem, calc((100vw - 1280px) / 2));
  z-index: 20;
  width: var(--toc-width);
  max-height: calc(100vh - 7rem);
  padding: 1rem;
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

html[data-theme="dark"] .lecture-toc {
  background: rgba(17, 20, 18, 0.86);
}

.lecture-toc p {
  margin: 0 0 0.6rem;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.lecture-toc nav {
  display: grid;
  gap: 0.28rem;
}

.toc-module {
  min-width: 0;
}

.lecture-toc a {
  display: block;
  padding: 0.42rem 0.5rem;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 760;
  text-decoration: none;
  border-radius: 4px;
}

.lecture-toc .toc-module-link {
  color: var(--ink);
  font-weight: 880;
}

.toc-concepts {
  display: none;
  gap: 0.08rem;
  padding: 0.1rem 0 0.28rem 0.55rem;
  margin-left: 0.42rem;
  border-left: 1px solid var(--line);
}

.toc-module.active .toc-concepts {
  display: grid;
}

.toc-concepts a {
  padding: 0.26rem 0.42rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 720;
  line-height: 1.25;
}

.lecture-toc a.active,
.lecture-toc a:hover,
.lecture-toc a:focus-visible {
  color: #fff;
  background: var(--accent);
  outline: none;
}

.toc-concepts a:hover,
.toc-concepts a:focus-visible {
  color: var(--ink);
  background: var(--soft);
}

.page-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  width: min(100% - 2rem, 940px);
  padding: 2rem 0 3rem;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

@media (min-width: 1320px) {
  .lecture,
  .page-footer {
    width: min(calc(100vw - var(--toc-width) - var(--toc-gap) - 4rem), 940px);
    margin-left: calc(max(1rem, calc((100vw - 1280px) / 2)) + var(--toc-width) + var(--toc-gap));
    margin-right: auto;
  }
}

@media (max-width: 1319px) {
  .lecture-toc {
    display: none;
  }

  .toc-toggle {
    display: inline-flex;
  }

  .lecture-toc.open {
    display: block;
    top: auto;
    right: 1rem;
    bottom: 4rem;
    left: auto;
    width: min(22rem, calc(100vw - 2rem));
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(8px);
  }

  html[data-theme="dark"] .lecture-toc.open {
    background: rgba(17, 20, 18, 0.96);
  }

  .lecture-toc.open .toc-concepts,
  .lecture-toc.open .toc-module.active .toc-concepts {
    display: none;
  }
}

@media (max-width: 980px) {
  .thesis-grid,
  .lesson-grid,
  .model-family-grid,
  .lookup-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .visual-example {
    grid-template-columns: 1fr;
  }

  .lab-canvas {
    height: 360px;
  }
}

@media (max-width: 760px) {
  .site-header,
  .module-nav,
  .panel-title {
    align-items: stretch;
  }

  .site-header,
  .panel-title {
    flex-direction: column;
  }

  .module-nav {
    flex-wrap: wrap;
  }

  .paper-header h1 {
    font-size: clamp(2.45rem, 12vw, 4rem);
  }

  .thesis-grid,
  .lesson-grid,
  .concept-grid,
  .model-family-grid,
  .template-grid,
  .reading-groups,
  .judgement-grid,
  .lab-controls-grid,
  .lookup-grid,
  .concept-card-grid,
  .concept-module-header,
  .concept-toolbar {
    grid-template-columns: 1fr;
  }

  .concept-module-header aside {
    justify-items: start;
    min-height: auto;
  }

  .concept-card dl > div {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .concept-count {
    text-align: left;
  }

  .lesson-grid article {
    min-height: auto;
  }

  .prob-row {
    grid-template-columns: 4.6rem 1fr 3.7rem;
  }

  .algorithm {
    font-size: 0.74rem;
  }

  .lab-canvas {
    height: 310px;
    min-height: 270px;
  }
}